12 free tools — 100% client-side, no signup

🔐 Encode / Decode

Base64 Encoder & Decoder
Popular
Encode and decode Base64 strings, files, URL-safe mode
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JWT Decoder
New
Decode JWT tokens, inspect header/payload, validate exp/iat
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⚡ Generators

UUID Generator
Generate UUID v4 (random) and v7 (timestamp), bulk mode
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Password Generator
Strong passwords with customizable length, characters, bulk
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Lorem Ipsum
Generate placeholder text — paragraphs, sentences, words
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Favicon Generator
Generate favicon set + manifest.json from any image
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CSS Gradient
Visual CSS gradient builder with live preview and code
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🛠 Formatters & Builders

JSON Formatter
Popular
Format, minify, validate and transform JSON data
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CRON Builder
Visual cron expression builder with human-readable output
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Meta Tags Generator
Generate SEO meta tags, Open Graph, Twitter cards with preview
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🧰 Dev Utilities

Timestamp Converter
Convert Unix timestamps to dates and vice versa
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LLM Price Calculator
Popular
Compare costs across AI models — GPT-4, Claude, Gemini, DeepSeek
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✓ 100% Local ✓ No Server ✓ No Signup ✓ Open Source Friendly

Frequently Asked Questions

Are these tools really free?

Yes, completely free with no limits. There are no premium tiers, no usage caps, and no accounts required. All tools run entirely in your browser using JavaScript — we don't even have a backend server to process your data.

Is my data safe when using these tools?

Absolutely. Every tool on this page runs 100% client-side in your browser. No data is ever sent to any server. You can verify this by opening your browser's Network tab — you'll see zero API calls during tool usage. Your data never leaves your device.

Can I use these tools offline?

Once the page is loaded, most tools work without an internet connection. They use only browser-native APIs (Web Crypto, Canvas, Clipboard). Bookmark the tools you use frequently for quick access.

What browsers are supported?

All modern browsers: Chrome 90+, Firefox 90+, Safari 15+, Edge 90+. Tools use standard Web APIs and work on both desktop and mobile devices. Some features like clipboard access may require HTTPS.

How is this different from other online tool sites?

Three key differences: (1) truly client-side — most competitors send your data to their servers, (2) no ads or tracking scripts slowing down the page, (3) developer-focused with features like bulk generation, keyboard shortcuts, and code-ready output formats.